Vanguard Natural adds Wyoming gas and oil properties for $581M

• Vanguard Natural Resources (NYSE:VNR) agrees to acquire natural gas and oil properties in Wyoming's Pinedale and Jonah fields from an unnamed source for $581M.
• The properties consist of ~87K acres currently producing ~113M cfe/day (80% natural gas, 4% oil, 16% natural gas liquids); the deal adds ~80% to VNR's reserves and 55% to its daily production.
• Shares halted.